Monthly Weather Bulletin
Generally, our country now facing Northeast Monsoon season, where the wind blowing consistently from northeast brought humidity that causes heavy rainfall continuously for four to seven days. Floods occurred for some lowland areas because this condition. Besides that, the record of temperature and solar radiation are higher than average for the same month but evaporation index is lower than average based on records of Main Meteorological Station over Malaysia.
Northeast Monsoon is one of the main monsoons for our country that started on November until March every year. This weather system build up with cold surge from Siberian areas and brought heavy rainfall continuously that caused flooded for the some areas especially Northeast Peninsular Malaysia included East Johor for the beginner of monsoon and the end of monsoon is expected occur over Sarawak and West Sabah.
Last November 2014, for Peninsular Malaysia especially Terengganu, Selangor, Negeri Sembilan, Malacca and West Johor has experienced humid condition where rainfall anomaly is from 20% to more than 60% above average with the total amount rainfall is 400 mm to 900 mm. For the same period, there are some area experienced dry conditions, there are the middle part of Pahang which received rainfall more than 60% below average with total amount less than 200 mm. Meanwhile, others area has received normal rainfall.
For the Sarawak, generally almost all areas received normal rainfall with total amount between 300 mm and 500 mm. But, Sibu and Bintulu Divisions was experienced wet condition with anomalies rainfall between 20% and 60% above average with total amount between 500 mm and 600 mm. Otherwise, Sri Aman Division has experienced dry condition which is anomaly rainfall decrease as much as from 20% until 40% below average with total amount less than 300 mm.
Mostly all areas over Sabah received normal rainfall for the last month with total amount between 200 mm and 300 mm. But there are some areas received less rainfall especially Kudat and Sandakan Divisions were rainfall anomaly decrease about 20% to 40% below average.
The number of raindays records shown that all Main Meteorological Station recorded more than 12 days for the last November 2014. For Peninsular Malaysia, the lowest number of raindays is 14 days as recorded at Meteorological Station Chuping and the highest number of raindays is 26 days as recorded at Meteorological Station Cameron Highlands. Meanwhile, for Sarawak the range of number of raindays is between 21 days as recorded at Meteorological Station Sri Aman and 25 days as recorded at Meteorological Station Limbang. And for Sabah, most of the area recorded higher number of raindays, where the range number of raindays is between 12 days as recorded at Meteorological Station Tawau and 23 days as recorded at Meteorological Station Labuan.
Almost all states have recorded a temperature higher than long term temperature in November. The average monthly temperature for lowland areas ranged from 24.4°C (Meteorological Station Ranau) to 28.1°C (Meteorological Station Pulau Langkawi) with the largest positive deviation is +1.2°C.
The mean minimum temperature for the lowland areas ranged from 20.8°C (Meteorological Station Ranau) to 25.3°C (Meteorological Station Pulau Langkawi). The lowest temperature recorded in the month is Ranau Meteorological station with reading of 19.2°C.
For the mean maximum temperature recorded between 29.9°C (Meteorological Station Gong Kedak) and 33.2°C (Meteorological Station Kota Kinabalu). The highest temperature of the month was recorded at the Meteorological Station Kluang with reading of 35.7°C.
Meanwhile, the single highland station is Meteorological Station Cameron Highlands recorded temperature ranging from 14.9°C to 25.1°C with an average temperature of 18.2°C.
Most of the station has recorded the higher value than average for this month. The average range of daily solar radiation in the lowland areas is from 13.16 MJm-² (Meteorological Station Kota Bharu) to 20.16 MJm-² (Meteorological Station Kota Kinabalu). Average solar radiation for this month in Cameron Highlands is 18.03 MJm-². The largest positive deviation from normal is +5.55 MJm-² (Meteorological Station Cameron Highlands) and the largest negative deviation is -1.81 MJm-² (Meteorological Station Bayan Lepas).
Mean daily evaporation rates for low lands areas is varied from 2.6 mm/day recorded at the Meteorological Station Kluang to 4.8 mm/day as recorded at the Meteorological Station Pulau Langkawi. Largest deviation negative from the normal have been recorded at the Meteorological Station Kota Bharu is -0.8 mm/day. Meanwhile, the average daily evaporation rate recorded at the Meteorological Station Cameron Highlands is 1.7 mm/day with the deviation from the normal is 0.1 mm/day.
FIGURE 1 : Rainfall Map for Malaysia
FIGURE 2a : Mean Monthly Temperature
FIGURE 2b : Mean Monthly Maximum Temperature
FIGURE 2c : Mean Monthly Minimum Temperature
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